| 非定常自由来流对二维翼型气动特性的影响研究 |
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| 引用本文： | 史志伟,明晓,王同光.非定常自由来流对二维翼型气动特性的影响研究[J].空气动力学学报,2008,26(4). |
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| 作者姓名： | 史志伟 明晓 王同光 |
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| 作者单位： | 南京航空航天大学航空宇航学院,江苏南京,210016 |
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| 基金项目： | 直升机旋翼动力学重点实验室基金
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| 摘 要： | 利用计算软件和实验测量方法,研究了非定常自由来流对静态二维翼型气动特性的影响,分析研究了来流速度脉动频率变化对气动特性产生的作用.结果表明,来流速度以短周期脉动时,升力系数随来流速度的减小而增加;来流速度以长周期脉动时,升力系数随来流速度的减小而减小.分析表明这与前缘分离涡在翼面上的传递过程有关.又利用二维翼型动态实验台,研究了非定常自由来流对做动态运动的二维翼型气动特性的影响.结果表明,来流风速的脉动使升力系数的迟滞包线进一步扩大,最大升力系数增加.
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| 关 键 词： | 非定常自由来流 NACA0012翼型 俯仰运动 分离涡 |
The effects of unsteady free stream on the static and pitching airfoils |
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| SHI Zhi-wei,MING Xiao,WANG Tong-guang.The effects of unsteady free stream on the static and pitching airfoils[J].Acta Aerodynamica Sinica,2008,26(4). |
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| Authors: | SHI Zhi-wei MING Xiao WANG Tong-guang |
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| Institution: | SHI Zhi-wei,MING Xiao,WANG Tong-guang(College of Aerospace Engineering,Nanjing University of Aeronautics , Astronautics,Nanjing 210016,China) |
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| Abstract: | The unsteady aerodynamic responses of the stationary or dynamic NACA0012 airfoil in the oscillating free stream have been investigated through the FLUENT software and the experimental measurements of the dynamic pressure distributions.The effects of frequencies of velocity perturbation are discussed.The physical mechanisms behind those changes are analyzed.The test results of the stationary airfoil in oscillating free stream show that,in the short period of oscillating free-stream,the lift coefficients incr... |
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| Keywords: | unsteady free stream NACA0012 airfoil pitching motion separated vortex |
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